October 29, 2020

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Textured Reasoning

Originally published April 24, 2011 LPOD-Apr24-11.jpg
image by Thilo Schramm, Kiel, Germany

Here is an image that is very different than any we have seen. It is a full Moon view but haves a strong 3-D effect. All Thilo did was "shift the blue channel some pixels." So this image is not revealing topography, but still reveals interesting features. Two things are most notable. First, rays show up like mare ridges because the displaced blue pixels look like shadows of the brighter red and green ones. Thus, the rays from Copernicus appear as radiating ridges. Older and fainter ridges must have less blue for they simply look like faint rays - see north-eastern Imbrium. The second notable feature is the ruggedness of some maria, especially Tranquillitatis. The offset of the blue pixels would have maximum 3-D effect for lunar materials that reflect more strongly in the blue - that would be titanium. Comparison with a compositional map shows a nearly perfect match of titanium and rough texture on the Thilo image. In fact, perhaps the reason rays don't appear as ridges in north east Imbrium is that the lavas there are titanium-poor. This would make sense because the small projectiles that make rays excavate the material where they hit.

Chuck Wood

Technical Details
17.04.2011; 23h30m, MESZ. Astrophysics Traveller, Focal length: 620mm; Camera: Point
Grey, Grasshopper, Filter: RGB; Digital Development: Photoshop CS3

Yesterday's LPOD: Spectacles

Tomorrow's LPOD: The Ultimate Meteor Shower


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